Arrange the principle soil profiles from top to Bottom.

A. A- horizon

B. B- horizon

C. C-horizon

D. O-horizon

E. R-horizon

Choose the correct answer from the options given below:

The correct answer is - 3) D, A, B, C, E

Key Points

• Soil Horizons
  • The soil profile is composed of layers known as horizons.
  • The correct order from top to bottom is:
    • D. O-horizon - Organic matter, such as decomposing leaves.
    • A. A-horizon - Topsoil, rich in minerals and organic material.
    • B. B-horizon - Subsoil, accumulation of leached minerals.
    • C. C-horizon - Weathered parent material, less organic matter.
    • E. R-horizon - Unweathered bedrock.

Additional Information

• O-horizon
  • Composed mostly of organic material including decomposed leaves and plants.
  • Essential for nutrient cycling and soil fertility.
• A-horizon
  • Also called topsoil, it is a mix of minerals and decomposed organic matter.
  • Most plant roots grow in this layer.
• B-horizon
  • Contains minerals leached from the A-horizon.
  • Known as the subsoil, it is denser and has less organic material.
• C-horizon
  • Consists of weathered parent material.
  • Little to no organic material is found here.
• R-horizon
  • Made up of unweathered bedrock.
  • This layer is not affected by soil-forming processes.